Processor Description Shows Error in VBA

I wrote a VBA program in excel 2007 (OS: windows XP SP1)

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Option Explicit
Public ProcNum As String
Sub Worksheet_Open()
With Application
.ScreenUpdating = False
.DisplayAlerts = False
.EnableEvents = False
Dim WMI As Object, WQL As String, Proc As Object, Procs As Object, i As Integer
Sheets.Add
i = 1
Set WMI = GetObject("winmgmts:")
WQL = "select * from win32_processor"
Set Procs = WMI.ExecQuery(WQL)
For Each Proc In Procs
Cells(i, 1).Value = Proc.getObjectText_
i = i + 1
Next Proc
Set WMI = Nothing
Set Procs = Nothing
With Range("B1")
.FormulaR1C1 = "=CLEAN(MID(RC1,SEARCH(""{"",RC1)+1,SEARCH(""}"",RC1)-SEARCH(""{"",RC1)-1))"
.Value = .Value
End With
Range("B1").TextToColumns Destination:=Range("B1"), DataType:=xlDelimited, _
TextQualifier:=xlDoubleQuote, Other:=True, OtherChar:=";", FieldInfo:=Array( _
Array(1, 1), Array(2, 1), Array(3, 1), Array(4, 1), Array(5, 1), Array(6, 1), _
Array(7, 1), Array(8, 1), Array(9, 1), Array(10, 1), Array(11, 1), Array(12, 1), _
Array(13, 1), Array(14, 1), Array(15, 1), Array(16, 1), Array(17, 1), Array(18, 1), _
Array(19, 1), Array(20, 1), Array(21, 1), Array(22, 1), Array(23, 1), Array(24, 1), _
Array(25, 1), Array(26, 1), Array(27, 1), Array(28, 1), Array(29, 1), Array(30, 1), _
Array(31, 1), Array(32, 1), Array(33, 1))
Range("B1:AG1").Copy
Range("B2").PasteSpecial Paste:=xlPasteAll, Transpose:=True
Application.CutCopyMode = False
Columns(1).Delete
Rows(1).Delete
Columns(1).TextToColumns Destination:=Range("A1"), DataType:=xlDelimited, _
TextQualifier:=xlDoubleQuote, Other:=True, OtherChar:="=", FieldInfo:=Array( _
Array(1, 1), Array(2, 1))
ProcNum = .Trim(.Substitute(Range("B21").Value, Chr(34), ""))
ActiveSheet.Delete
.EnableEvents = True
.DisplayAlerts = True
.ScreenUpdating = True
End With
MsgBox "Processor number is: " & ProcNum & vbCrLf & "Hard drive serial number is: " & DriveSerialNumber
End Sub

Function DriveSerialNumber() As String
Dim FSO As Object
Set FSO = CreateObject("Scripting.FileSystemObject")
DriveSerialNumber = Format(CDbl(FSO.Drives("C:").SerialNumber))

End Function
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It shows an error 'AUTOMATION ERROR' when executing the line "For Each Proc In Procs".

Please help me.